Stapling and tacking machine



, I Sept 22, 1936- A. 1.. HANSEN 2,055,380

STAPLING AND TACKING MACHINE Filed Dec. 2, 1935 "ji 22 22 a 26 M. v 5% Patented Sept. 22, 1936 m i' OFFICE s'rArLINGIANDFTACKINGTMA mNE Ii Augieiliiiflans'en; Chicago, Ill., assig nor to A. .Hansen'Y-Mfg. C'.,. .Chioago,;Ill:, a'icorporation of l Illinois-w 1 Application D'ecemben. 2, 1935,: Seri'alflNti, 52,493

:Giaims.' (01. 1-49) Thisiinvention. relates I to stapling andrtaclrling,v machines of the kind used for. driving wire staples! It relates particularly to theutypemof' stapling machine in which thestaples are driven bymeans 5 of a spring-actuated hammerloftlie general'type shown in Patent .No.J-1,-9'78,'983, 'i'ssuedOctober 30, 1'934jto H. J2 Baur;

In stapling machines of the kind, the driving end of the hammer consists of a blade which operates in a way provided by two spaced plates between which the blade reciprocates when driving the staples, which are automatically fed one by one to said way in driving alignment with saidblade. These plates are spaced apart by flanges presented by members of the housing containing the guideway for the staples, against which flanges they are held rigidly by means of screws taking through said plates and flanges.

In the operation of a stapling machine of the kind, these plates are subjected to violent vibra tion and are apt to come loose, with the result that the blade fails to properly drive the staple. The object of the present invention is to provide means for efficiently locking said screws against rotative movement and thus maintaining the two plates providing the way for the driving blade in the required spaced relation.

This and other advantages of the invention will appear more clearly as I proceed with my speci- 30 fication.

In the drawing:-

Figure 1 is a perspective view of a stapling machine of the kind described;

Figure 2 is a front elevation of the outer plate providing the way for the hammer blade, showing the improved lock member engaged with the heads of the screws by which said plate is secured to the arm;

Figure 3 is a rear view of the same with the screws omitted;

Figure 4 is a perspective view of a lock member included in the invention;

Figure 5 is a transverse section through the front end of the hammer carrying arm in a plane 45 indicated by the line 5-5 of Figure 1; and

Figure 6 is a vertical section through Figure 3 in a plane indicated by the line 66 of Figure 3.

Referring now to the drawing:--I0 indicates the base of the machine; I l indicates the head at 5 the front end of the base enclosing the familiar spring-controlled plunger which carries the driving blade at its lower end; and I2 indicates the arm for operating the machine.

The driving blade and the spaced plates pro- 55 viding the way through which it operates, are

illustrated inIFi'gure 5. In said figure, I! and I8 indicate;.respectively,.the front and back plates at the. forwardflend of .the base In, which, plates, are ,securedlto. opposite faces ofiinturned flanges 23Iat the. front,..end of a channel. 'member 2| extendinglongitudinally,of. the-base. l0. Headed. screws 22, 22taking tliroughthe lateralmargins of the front plate H, the flanges 20 and the lateral margins of the back plate l8, clamp the two plates rigidly in position.

These parts are familiar and may be as described in the aforesaid patent and require no further description.

As stated above, the vibration produced in the operation of the hammer, gradually works the screws 22 loose, with the result that the guideway is enlarged and the staple isnot always driven properly. To cure this evil, I provide the following construction.

Between the heads 22a of the screws 22 I mount a yoke 23. This yoke, as shown, consists of a substantially rectangular plate through which is cut a T-slot to provide a top bar 24 and depending laterally spaced arms 25, 25.

The yoke is secured to the outer plate I! by means of a headed screw 26 which is threaded through the plate I1 and has its inner end upset as at 26b in a recess 2'! formed at the back of the plate, thus locking the yoke to the plate I1. The head 26a of the screw 26 is conical and is engaged against conical seats 25a on the proximate edges of the depending arms 25 of the yoke. The construction is such that when the screw 26 is screwed inwardly with respect to the plate l1, its conical head 26a will act as a wedge to spread the arms 25 of the yoke apart. The outer edges of the arms 25 are formed to provide jaws 25b for engagement with the rounded head 22a of the screws 22. By spreading apart the yoke 25, the jaws 25b at the outer edges of said arms will be forcibly and frictionally engaged with the heads of said screws, thus locking them against rotative movement.

The construction described rigidly locks the securing screws 22 against rotative movement, with the result that the original width of the way for the hammer blade is maintained.

I claim as my invention:-

1. In a stapling machine, in combination with a driving blade, front and rear spaced plates defining the way of said blade, means for securing said plates in position including headed screws extending through the margins of said plates, a yoke carried by said front plate comprising a top bar and laterally spaced depending arms havplates, a yoke carried by said front plate com-. .l

prising a top bar and laterally spaced depending arms having jaws adapted for engagement with the heads of said screws, a screwthreaded having a conical head, said yoke arms having conical seats at their proximate edges for said screws extending through the margins of said plates, a yoke carried by said front plate, said yoke comprising a top bar and laterally spaced conical head, and means for retaining said "eon:

depending arms having jaws adapted for engagement with the heads of said screws, a screw threaded into said front plate between said yoke arms and having its end upset in a recess provided in the rear face of said front plate, said screw having a conical head, and said yoke arms having conical seats at their proximate edges for said conical head.

4. In a'stapling -machine, jin combination with a driving blade, -front and rear spaced plates defining the way for 'said blade, means for securing said plates in position including screws extending through the margins of said plates, an

"expandible member interposed on said front :plat'eibetween ,and engaging said screws, and into said front plate between said'yoke arms and,

means. for expanding .said member.

5. In a stapling machine, in combination with a. driving blade, ,front and rear spaced plates defining the way for "said blade, means for se- "curingiisaid plates in position including screws extending through the margins of said plates, an expandible member interposed on said front platje'"' b'et'w'een and engaging said screws, and means for expanding said member including a screwwithfaj conical head, by which said member'is secured to saidfront plate.

I 'AUGIE L. HANSEN. 

